What best practice should the user follow when structuring the PHP code in relation to the HTML code for form processing?

When structuring PHP code in relation to HTML code for form processing, it is best practice to separate the PHP code from the HTML code to improve readability and maintainability. This can be achieved by placing the PHP code at the top of the file or in a separate file and using PHP to process the form data before displaying any HTML content. 

<?php
// Process form data
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Retrieve form data
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Process form data or perform validation
    
    // Display success message or errors
    if ($success) {
        echo "<p>Form submitted successfully!</p>";
    } else {
        echo "<p>Error submitting form. Please try again.</p>";
    }
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Form Processing</title>
</head>
<body>
    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
        <label for="name">Name:</label>
        <input type="text" name="name" id="name">
        
        <label for="email">Email:</label>
        <input type="email" name="email" id="email">
        
        <input type="submit" value="Submit">
    </form>
</body>
</html>

Keywords

PHP HTML form processing separation of concerns MVC architecture

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